42009642943 has 4 divisors (see below), whose sum is σ = 42034815160. Its totient is φ = 41984470728.

The previous prime is 42009642937. The next prime is 42009642989. The reversal of 42009642943 is 34924690024.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42009642943 - 2²¹ = 42007545791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42009642943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42009642923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12583605 + ... + 12586942.

It is an arithmetic number, because the mean of its divisors is an integer number (10508703790).

Almost surely, 2^42009642943 is an apocalyptic number.

42009642943 is a deficient number, since it is larger than the sum of its proper divisors (25172217).

42009642943 is a wasteful number, since it uses less digits than its factorization.

42009642943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25172216.

The product of its (nonzero) digits is 373248, while the sum is 43.

The spelling of 42009642943 in words is "forty-two billion, nine million, six hundred forty-two thousand, nine hundred forty-three".